The BGS Lexicon of Named Rock Units — Result Details

Coal Measures Group [N Ireland only]

Computer Code: CM Preferred Map Code: CM
Status Code: Full
Age range: Westphalian Stage (CW) — Westphalian Stage (CW)
Lithological Description: Obsolete except in Northern Ireland. Replaced by Scottish Coal Measures Group (CMSC), Pennine Coal Measures Group (PCM), and South Wales Coal Measures Group (SWCM). Alternation of sandstone, grey siltstone and grey mudstone, with frequent coal seams and seatearth horizons. Lower Westphalian (Waters et al., 2007).
Definition of Lower Boundary: none recorded or not applicable
Definition of Upper Boundary: none recorded or not applicable
Thickness: none recorded or not applicable
Geographical Limits: Northern Ireland.
Parent Unit: Not Applicable (-)
Previous Name(s): Productive Coal Measures [Obsolete Name and Code: Use CM] (LMCM)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Besley B M, 1988. Palaeogeographic implications of late Westphalian to early Permian red-beds, central England. "In" Sedimentation in a synorogenic basin complex. Besley B M and Kelling, G, editors. 
Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) 
Whitehead, T H and Pocock, R W. 1947. Geology of the country around Dudley and Bridgnorth. Memoir of the British Geological Survey, Sheet 167. (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E024 E261 E262 E245 E231 E232 E234 E233 E107 N35 E055 E065 E064 E072 E080 E089 E018 S013 E103 E115 E128 E201 E217 E235 E236 E237 E268 E167 S039 E273 E274 E246 E049